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https://issues.apache.org/jira/browse/KAFKA-3468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15753998#comment-15753998
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Marco Buccini commented on KAFKA-3468:
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I bumped into the same issue yesterday, and I tried to figure out another way
to deal with this problem.
The main reason is that the producer is part of a more complex scenario, and
whenever I try to stop the main application (e.g., with Ctrl+C), the producer
will loop forever until I kill the application. However, this is something we
would like to avoid.
Is there a better way to deal with this issue? I have tried to use the producer
in a synchronous way, so that whenever there is an exception, I close the
producer and that should do the trick, but this also means that I would lose
all the benefits of the asynchronous producer.
> Java clients never fail when bootstrap uses incorrect port
> ----------------------------------------------------------
>
> Key: KAFKA-3468
> URL: https://issues.apache.org/jira/browse/KAFKA-3468
> Project: Kafka
> Issue Type: Bug
> Reporter: Grant Henke
>
> When a client bootstrap uses a valid host but an incorrect port, the java
> clients will never fail but instead loop forever trying to fetch metadata. A
> sample debug log of the consumer is:
> {noformat}
> [2016-03-25 11:37:39,880] DEBUG Initialize connection to node -1 for sending
> metadata request (org.apache.kafka.clients.NetworkClient:629)
> [2016-03-25 11:37:39,880] DEBUG Initiating connection to node -1 at
> localhost:9999. (org.apache.kafka.clients.NetworkClient:492)
> [2016-03-25 11:37:39,881] DEBUG Node -1 disconnected.
> (org.apache.kafka.clients.NetworkClient:459)
> [2016-03-25 11:37:39,881] DEBUG Give up sending metadata request since no
> node is available (org.apache.kafka.clients.NetworkClient:614)
> [2016-03-25 11:37:39,983] DEBUG Initialize connection to node -1 for sending
> metadata request (org.apache.kafka.clients.NetworkClient:629)
> [2016-03-25 11:37:39,983] DEBUG Initiating connection to node -1 at
> localhost:9999. (org.apache.kafka.clients.NetworkClient:492)
> [2016-03-25 11:37:39,984] DEBUG Node -1 disconnected.
> (org.apache.kafka.clients.NetworkClient:459)
> [2016-03-25 11:37:39,985] DEBUG Give up sending metadata request since no
> node is available (org.apache.kafka.clients.NetworkClient:614)
> [2016-03-25 11:37:40,090] DEBUG Initialize connection to node -1 for sending
> metadata request (org.apache.kafka.clients.NetworkClient:629)
> [2016-03-25 11:37:40,090] DEBUG Initiating connection to node -1 at
> localhost:9999. (org.apache.kafka.clients.NetworkClient:492)
> [2016-03-25 11:37:40,091] DEBUG Node -1 disconnected.
> (org.apache.kafka.clients.NetworkClient:459)
> [2016-03-25 11:37:40,091] DEBUG Give up sending metadata request since no
> node is available (org.apache.kafka.clients.NetworkClient:614)
> {noformat}
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